Nice build, hope your health issues are behind you.
Question: What valves are you running and did you get a chance to look at the roller to valve tip contact? Asking as I am running valves that have stems that are nearly .100 longer than stock and the B3 spacers had a positive effect on reducing the roller contact patch. The downside was the B3 spacers moved the rocker shaft up enough that I had to modify the stock valve cover for clearance. That Mopar Performance VC does not have the step down on the ends so that should help.
And you have a real nice build going, but let me offer this, if I am seeing the fuel flow correctly the fuel comes in the fire wall end of the rail and out the radiator end. That is exactly how I ran mine. I put the regulator at the exit end of the 180 degree turn on the radiator end using a custom bent U that put back clearance in to fit the regulator. Mounted the regulator on a simple bracket that connects to the fuel rail bracket. That would save a couple of lengths of woven fuel hose and the closer the regulator is to the rail the more accurate it will be at the injectors. The fuel return path is then a straight path back along side of the fuel rail.